We are using Fleck as a WebSocket Server implementation. With latest release Xamarin.Mac / Mono, there is a bug in Mono SslStream which causes read to block write. See discussion at mono issue 18865. (Sorry, I can't post a link)
I believe that Xamarin.mac 18.104.22.168 was built before the breaking PR was merged. Could I get a link to download the older version of Xamarin.Mac to use until a newer build of Xamarin.Mac is released?